He was born on September 1839, in Cambriage and died on April, 1914 in Pennsylvania. His father was Benjamin Peirce, was astronomist and mathematician. He studied of logic at the age of 12. Later he started University at the age of 16. Also, he was assistant at the astromical observatory. In 1862 got married and he’s got his Master in philosophy. Then in 1867 became a member of the academy of art and science. He was published ‘photometric researches’ in 1878. Some important works are: - The studies of logic (1883) - The architecture of the theories (1890) - What is a sign? (1894) - What is the pragmatism? (1905) - The bird of the pragmatism (1905)

The Sr. Ferdinand Saussure and his Course in General Linguistic allows us to understand that the pronounciation of a word can reveal different things, for example depending on whether the word is considered as sound, as the expression of an idea, etc., it is thanks to the important ideas on structure of the language that he gave. The language is not only a concrete statement that the speakers, but a "system" in that all elements are interrelated. Saussure stablished the dichotomous formulations that playing a rol outstanding in the linguistic sign. Is fundamental to comprend some concepts as lingusitic sign that is related with the we called "acoustic image" or " signifier" that is the mental representation of the sound or signified of these idea or thing. Also we have the linguistic sign that has two features; arbitrary because the link between signifier and signified is conventional-social imposed for a community and the linear that represents a span of time in a dimension. The phenomeno sinchrony is the system of a langue in a determined time, it sets the principles of the statea lenguage. For other side is the diachrony that analizes the differences, the changes, new accents,new words in the moment, in the time.Saussure enunciates in his work the inmutability and mutabilityof the sign; the first take into account the signifier and their idea is fixed, not free, depending the linguistic community that uses it, and the second is about of continuity language in the time. Finally in the syntagm the terms are associated in the memory but have different results; and the paradigm are relations of sustitution.